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Finding the Fourth Proportional to 8,119.40, 12,171.90 and 3,187.40

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Solution

The fourth proportional to 8,119.40, 12,171.90 and 3,187.40 is: 4,778.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,119.40 : 12,171.90 = 3,187.40 : x
  2. Step 2: Convert to fraction form
    8,119.40/12,171.90 = 3,187.40/x
  3. Step 3: Cross multiply
    8,119.40x = 12,171.90 × 3,187.40
  4. Step 4: Simplify right side
    8,119.40x = 38,796,714.06
  5. Step 5: Solve for x
    x = 38,796,714.06/8,119.40
  6. Step 6: Final answer
    x = 4,778.27

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.